"What Makes Olga Run?" author Bruce Grierson has written nine rules for living a longer, happier life which were inspired by his book's central subject, 94-year-old Canadian track star Olga Kotelko.

"We're all individual and there's so much variation between people. But there's enough things that Olga does that the science backs up that I felt comfortable about saying: 'These nine things most people will benefit from,'" author Bruce Grierson said.